<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button id="btn">确认</button>

    <script>
        let btn = document.getElementById('btn')

        function handle() {
            console.log('确认向后端发请求');

        }
        btn.addEventListener('click',throttle(handle,2000))
        
        function throttle(fn,wait){
            let preTime = 0
            return function(...arg){
                let nowTime = Date.now() //第一次点击的时间戳
                // fn()
                if(nowTime -preTime >=wait){
                    fn.call(this,...arg)
                    preTime =nowTime
                }
            }
        }
    </script>
</body>
</html>